Magnetic separator.



Patented May 28, MIL

No. 675,056. I

T. A. mson. MAGNETIC SEPARATOB.

(Applicatiog filed. June 12, 1897.) (No Modal.)

. a w a WITNESSES: I VENTOR BY 0% ##Quj a ATTORNEYS n1: NORRIS PETERSco. PHOTO-LITHO.. wAsnmuTON. o c

UNTTED STATES PATENT OFFICE.

THOMAS A. EDISON, OF LLEWELLYN PARK, NEIV JERSEY.

MAGNETIC SEPARATOR.

SPECIFICATION forming part Of Letters Patent No. 675,056, dated May 28,1901.

.. Application filed June 12, 1897. Serial No. 640,418. (No model.)

To all wit/mt it may concern:

Be it known that I, THOMAS A. EDISON, a citizen of the United States,residing at Llewellyn Park, in the county of Essex and State of NewJersey, have invented a certain new and useful Improvement in MagneticSeparators, (Case No. 973,) of which the following is a specification.

The object I have in view is to produce a separator for ground materialcontaining magnetic and non-magnetic particles particularly adapted forthe separation of ground magnetic iron ore, which separator will besimple in construction and effective in operation. V

In the accompanying drawings, forming a part hereof, Figure 1 is a view,partly in diagram, of apparatus embodying my present invention; and Fig.2 is an elevation and partial section of the magnet employed in the.

apparatus looking at one of the polar faces.

Ais a bar-magnet having an iron core N S, which has a minimum lengthbetween the poles and a maximum length at right angles to a lineconnecting the poles. For illustration of the proper proportions forthis magnet-core I may say that I have found it desirable in practice touse as a core a soft-iron bar having a length of four feet six inches, awidth of one foot,'and a thickness of three inches. The magnetizing-coilB is wound lengthwise over the ends of this bar and over the fiat sidefaces, leaving exposed for the polar faces the side edges of the bar.The coil 13 is maintained in place by strips of wood a, which aresecured to the magnet-core by screws 7). This magnet is arranged withits greatest length in a horizontal plane, and it is supported bylegs con suitable beams or blocks. (Not shown.)

C is a hopper having an oblong bottom, from which the ore is fed, bymeans of a roller D, in a thin sheet having a width approximately thatof the horizontal length of the pole of the magnet. The rear side 01 ofthe hopper fits closely the surface of the roller, while the front sidee of the hopper terminates above the center of the roller, leaving anarrow dischargingthroat f between it and the roller, which openshorizontally, so that the ore will not run out of the hopper unless theroller is turning. lhe roller projects approximately one-half itsdiameter beyond the throatf and is turned away from the throat, as shownby the arrow, so as to carry the ore over its upper side. This thin andwide stream of ore falls upon an inclined board E, which arrests to acertain extent the movement of the ore and spreads the stream ofpulverized material still further. The checking and spreading board Edelivers the stream of pulverized material to another checking andspreading board F, inclined in the opposite direction, which latterboard delivers the stream of pulverized material to the polar face ofthe magnet throughout its length, where it adheres in the form of amagnetbrush G. To still further arrest the motion of the material and toreduce somewhat the strength of adherence of the magnetic brush to thepolar face, there is secured to the polar face an angle-piece H, ofbrass, which extends the entire length of the polar face, the pulverizedmaterial being delivered so as to strike the top of the horizontal ledgeformed by this brass angle-piece.

I is a dividing-board located below the polar face, dividing themagnetic and non-magnetic materials and directing them into differentreceptacles. The other polar face of the magnet is utilized in the samemanner, another set of similar parts being employed to direct a streamof ore against the other polar face.

The stream of ore being fed directly against the magnetic brush, whichis attached to the polar face of the magnet,the non-magnetic particlesrebound therefrom and fall outside of the partition I, while themagnetic particles adhere to the magnetic brush. The magnetic brushbeing overloaded, the magnetic material detaches itself therefrom inbunches or clots, which in falling away from the magnet tend to havetheir trajectory changed by the attraction of the magnet, so that theyfall inside of the dividing-board. The magnet having a minimum lengthbetween its polar faces produces a concentrated field of force in whichthe magnetic lines curve abruptly away from the polar faces, asindicated by the dotted lines in Fig. 1, and the magnetic particles infalling away from the brush through this concentrated field tend tofollow the lines of force, and hence are moved inwardly out of avertical line a sufficient distance to separate them from the fallingstreamwof non-magnetic particles.

What I claim is- I. A' magnetic separator having-an oblong bar-magnetwound over the length of the bar and arranged in a horizontal positionso as to present a laterally-extended polar face, in combination withmeans arranged to feed the mixed magnetic and non-magnetic materialdirectly to the polar face of the magnet, and means for automaticallyand separately receiving the magnetic and non-magnetic particlescontinuously separated by the magnetic action, substantially as setforth.

2. In a magnetic separator, the combination with a bar-magnet having apolar face which is narrow vertically, of means for feeding a stream ofmingled magnetic and nonmagnetic particles directly to the polar face ofthe magnet, whereby the non-magnetic particles will rebound and fallaway from the polar face in a vertical line, While the magneticparticles in falling away from the polar face will have their trajectorychanged in passing through the field of the magnet, and means forautomatically and separately receiving the magnetic and non-magneticparticles continuously separated by the magnetic action, substantiallyas set forth.

3. In a magnetic separator, an oblong barmagnet Wound lengthwise of thecore and presenting polar faces at the side edges of the core, saidmagnet being arranged in a horizontal position and having a minimumlength between the polar faces so as to present a concentrated field offorce, in combination with 1 means for feeding a wideand thin stream ofmingled magnetic and non-magnetic particles directly against the polarface of the magnet, whereby the non-magnetic particles will rebound fromthe magnet and fall in a vertical line, while the magnetic particles infalling away from the magnet will have their trajectory changed inpassing through the concentrated magnetic field, and means forautomatically and separately receiving the magnetic and non-magneticparticles continuously separated by the magnetic action, substantiallyas set forth.

4. In a magnetic separator, the combination with abar-magnet having avertical polar face, of a horizontal non-magnetic projection from suchpolar face, and means for feeding a mingled stream of magnetic andnon-magnetic particles directly to said polar face and upon saidhorizontal projection whereby the movement of the material will bearrested and the non-magnetic particles will rebound away from the polarface, substantially as set forth.

5. In a magnetic separator, the combination with a bar-magnet having anarrow ledge or shelf of non-magnetic material secured to its polarface, of means for feeding a mingled stream of magnetic and non-magneticpar-' ticles directly to said polar face and upon said non-magneticledge, substantially as set forth.

6. In a magnetic separator, the combination with a horizontalbar-magnet, of means for feeding a stream of mingled magnetic andnon-magnetic particles directly against the polar face of the magnet,means for retarding the movement of the stream before it is delivered tothe magnet, and means for automatically and separately receiving themagnetic and non-magnetic particles continu ously separated by themagnetic action, sub stantially as set forth.

7. In a magnetic separator, t'he combination with a horizontalbar-magnet to the polar face of which mingled magnetic and non-magneticparticles are directly fed, of the oppositely-inclined checking andspreading boards over which the stream of particles passes beforereaching the magnet, and means for antomatically and separatelyreceiving the magnetic and non-magnetic particles continuously separatedby the magnetic action, substantially as set forth.

8. In a magnetic separator, the combination with a separating-magnet, ofa hopper and a feeding-roller relatively arranged so as to produce ahorizontally-opening dischargethroat above the roller, whereby a thinstream of mingled magnetic and non-magnetic particles will be deliveredby the roller directly to the polar face of said magnet, and means forautomatically and. separately receiving the magnetic and non-magneticparticles continuously separated by the magnetic action, substantiallyas set forth.

9. In a magnetic separator, the combination with a bar-magnet of oblongform arranged in a horizontal position, of a hopper and a rollerdelivering the mingled magnetic and non-magnetic material directly tothe polar face in a thin and wide stream from the bottom of the hopper,and means for automatically and separately receiving the magnetic andnon-magnetic particles continuously separated by the magnetic action,substantially as set forth.

10. In a magnetic separator, the combination with a bar-magnet "to thepolar face of which the material is directly fed, of a hopper having aroller-feed,-the oppositely-inclined checking and spreading boards, andmeans, for automatically and separately receiving the magnetic andnon-magnetic particles continuously separated by the magnetic action,substantially as set forth.

11. In a magnetic separator, the combination with a bar-magnet, of ashelf or ledge of non-magnetic material secured to the polar face of themagnet,and the oppositely-inclined checking and spreading boards overwhich the stream of mingled magnetic and nonmagnetic particles passesand by which such stream is delivered to the polar face of the magnetand upon said non-magnetic shelf, substantially as set forth.

12. In a magnetic separator, the combination with a bar-magnet, of meansfor feeding two streams of mingled magnetic and nonmagnetic materialsdirectly to the opposite polar faces of said magnet, and means forantomatically and separately receiving the magnetic and non-magneticparticles continuously separated by the magnetic action, sub stantiallyas set forth.

13. In a magnetic separator, an oblong harmagnet arranged in ahorizontal position wound lengthwise over the bar, whosehorizontally-extended side edges form the polar faces, such magnethaving a minimum length between the polar faces so as to produce aconcentrated field of force, in combination With means for feeding twostreams of mingled magnetic and non-magnetic material directly THOMAS A.EDISON. lVitnesses:

JNo. R. TAYLOR, EUGENE COUSAN.

